This bug was closed while I was sleeping, but I will mention anyway
that with 7:3.3.3-1 those commands give a SIGBUS, as expected, but
only if /proc is mounted.
Presumably with the fixed version, 7:3.3.3-2, performance will be
measurably worse on a system with NEON when /proc is not mounted.
Upstream should probably switch to using getauxval(). Do you want to
suggest it to them?